ISO 21819-1:2018

INTERNATIONAL ISO
STANDARD 21819-1
First edition
2018-08
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Characteristic of piezoelectric
properties under high-load
conditions —
Part 1:
Resonant-antiresonant method under
high-temperature conditions
Céramiques techniques (céramiques avancées, céramiques techniques
avancées) — Caractéristique des propriétés piézoélectriques en
conditions de charge élevée —
Partie 1: Méthode résonante-antirésonante à des températures élevées
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Principle . 2
6 Specimens . 2
7 Measurement equipment . 2
7.1 General . 2
7.2 Impedance analyser . 3
7.3 Thermostat chamber . 3
7.4 Thermocouple . 3
7.5 Recorder . 3
7.6 Test piece holder . 4
8 Measurement conditions . 4
9 Measurement procedure . 4
10 Calculation procedures of measured results . 5
10.1 Calculation of measurement data . 5
10.2 Rate of change of electromechanical coupling coefficient . . 5
11 Test report . 5
Annex A (informative) Example of a data evaluation . 7
Bibliography . 8
Foreword
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This document was prepared by Technical Committee ISO/TC 206, Fine ceramics.
A list of all parts in the ISO 21819 series can be found on the ISO website.
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iv © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 21819-1:2018(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Characteristic of piezoelectric properties
under high-load conditions —
Part 1:
Resonant-antiresonant method under high-temperature
conditions
1 Scope
This document specifies a method of measuring piezoelectric properties of piezoelectric fine ceramics
and other piezoelectric devices under high-temperature conditions, where the electromechanical
coupling coefficient is determined based on measurements of resonance/antiresonance frequencies
using impedance analysers.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60584-1, Thermocouples — Part 1: Reference tables
IEC 60584-2, Thermocouples — Part 2: Tolerances
EN 50324-1, Piezoelectric properties of ceramic materials and components — Part 1: Terms and definitions
EN 50324-2, Piezoelectric properties of ceramic materials and components — Part 2: Method of
measurement — Low power
EN 50324-3, Piezoelectric properties of ceramic materials and components — Part 3: Method of
measurement — High power
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50324-1, EN 50324-2 and
EN 50324-3 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
resonant-antiresonant method
method where the ratio of mutual conversion between electrical energy and mechanical energy is
measured based on the resonance frequency and antiresonance frequency of piezoelectric fine ceramics
and other piezoelectric devices
3.2
resonance frequency
f
r
lower of two frequencies at which admittance or impedance between electrodes of a transducer
achieves zero phase in the vicinity of the target vibration mode
3.3
antiresonance frequency
f
a
higher of two frequencies at which admittance or impedance between electrodes of a transducer
achieves zero phase in the vicinity of the target vibration mode
4 Symbols
Δk(t) Rate of change of electromechanical coupling coefficient (%)
k Electromechanical coupling coefficient after holding for t min after the test piece reaches
t
the test temperature ± 2 °C
k Electro
...